CTC may represent a comprehensive examination for CRC staging as it allows for the evaluation of the inner and outer colonic wall. In addition, PET/CT is increasingly being applied in oncology to assist with initial staging of tumors as well as monitoring response to therapy in several disease sites.7
8. Radiotherapy for Colorectal Cancer: Current Standards and Future Perspectives. Matthias F. Häfnera,b,* and Jürgen Debusa,b Visc Med. 2016 Jun; 32(3): 172–177.